42445805 has 4 divisors (see below), whose sum is σ = 50934972. Its totient is φ = 33956640.

The previous prime is 42445801. The next prime is 42445807. The reversal of 42445805 is 50854424.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8375236 + 34070569 = 2894^2 + 5837^2 .

It is not a de Polignac number, because 42445805 - 2² = 42445801 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42445801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4244576 + ... + 4244585.

It is an arithmetic number, because the mean of its divisors is an integer number (12733743).

Almost surely, 2^42445805 is an apocalyptic number.

It is an amenable number.

42445805 is a deficient number, since it is larger than the sum of its proper divisors (8489167).

42445805 is an equidigital number, since it uses as much as digits as its factorization.

42445805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8489166.

The product of its (nonzero) digits is 25600, while the sum is 32.

The square root of 42445805 is about 6515.0445125110. The cubic root of 42445805 is about 348.8282036654.

The spelling of 42445805 in words is "forty-two million, four hundred forty-five thousand, eight hundred five".